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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 28 |
| 3 | 164 |
| 4 | 976 |
| 5 | 5840 |
| 6 | 35008 |
| 7 | 209984 |
| 8 | 1259776 |
| 9 | 7558400 |
| 10 | 45349888 |
| 11 | 272098304 |
| 12 | 1632587776 |
| 13 | 9795522560 |
| 14 | 58773127168 |
| 15 | 352638746624 |
| 16 | 2115832446976 |
| 17 | 12694994616320 |
| 18 | 76169967566848 |
| 19 | 457019805138944 |
| 20 | 2742118830309376 |
[1,5,28,164,976,5840,35008,209984,1259776,7558400, 45349888,272098304,1632587776,9795522560, 58773127168,352638746624,2115832446976, 12694994616320,76169967566848,457019805138944, 2742118830309376] |